STAND DESCRIPTION

Plot Name: Reference Stand 13 (Wildcat Mountain Res.Nat.Area)
Plot Size: 4.69 ha
Established: 1972, expanded 1977
Remeasurements: 1976, 1977, 1981, 1982, 1986, 1991, 1997
Site Description
Latitude: 44.34
Longitude: 122.12
Elevation: 1340 m
Aspect: SW
Slope: 30 to 45%
Landform: concave pediment backslope
Soil Parent Material: colluvium derived from pink and gray porphyritic flow rocks with a significant mixture of volcanic ash and pumice
Soil: Dystrandepts
Plant Association: Abies procera/Clintonia uniflora
Age class: mature

Soils:

The soil is deep, well drained, very dark brown silt loam over dark brown silt loam and gravelly silt loam. Depth to the very gravelly silt loam C horizon is 120 cm.

General Stand Description:

This reference stand is a good fit with the ABPR/CLUN community described by Dyrness et al. (1974). Successional relationships of overstory and understory trees making up this stand are characteristic of the habitat type and indicate the probable direction of development towards the climax ABAM/TIUN association. The dense tree canopy dominated by early seral species of medium to large diameter, the sparse shrub cover, the high herb cover as well as its richness, are all characteristic of the ABPR/CLUN community. Density and size class of the Abies Amabilis indicate a mid-seral stage in which Abies amabilis has yet to penetrate the tall tree canopy.
The tree canopy is dominated by almost equal numbers of 135-year-old Pseudotsuga menziesii and Abies procera. The only common understory tree species is Abies amabilis, which has not yet attained diameters greater than 25 cm.
The shrub layer is poorly developed. Major species are Acer circinatum, Vaccinium membranaceum, and Rubus lasiococcus. The herb layer is patchy but well developed. It is dominated by Smilacina stellata and contains high cover of Achlys triphylla and Clintonia uniflora. The moss layer is virtually absent.
Stand Structure and Composition
Live Tree Data at Last Measurement (1997)
Coarse Woody Debris: no data available
Ecosystem and Population Dynamics (measurements for most recent interval, 1991-1997)
Net Bole Production: 1.7 Mg/ha/yr
Annual Mortality: 17.2 Mg/ha/yr
Percent of Trees Dying: total-2.2%/yr